Expected behavior: The number after the “+” in the tooltip descriptions for weapons and tools would show how much damage they add to an attack over the damage power of bare hands, that is, (damage) = (bare hand damage + tooltip damage value)

Observed behavior: The total damage done by each weapon and tool is (1 + tooltip damage value), but bare hands do 2 damage, not 1.

Steps to reproduce:
1. Spawn a creeper.
2. Kill it with a mele trident. It will take 3 hits.
3. The trident tooltip says +8 damage, so each hit should do 2 + 8 = 10 damage, and the creeper should die after 2 hits, but it does not.
4. In fact each hit does 1 + 8 = 9 damage. You can verify this by spawning a creeper, hitting it twice with a mele trident, and then once with bare hands. This will kill the creeper.
5. You can repeat these steps for any weapon or tool. For example, hitting with a stone axe does 5 damage, not 6.

Note that according to MCPE-10700, it is intended that bare hand punches do 2 damage.